On hot, sunny days you can greatly reduce the temperature inside your vehicle and protect your interior from harmful UV rays with this custom-fit heat shield. One side is highly reflective silver fabric and the other is finished in soft felt. Both materials are laminated to a foam core board which acts as an insulator to help reduce heat buildup in the vehicle. Pre-sewn panels accordion for handy storage. Theres no extra hardware or hassles - just unfold and position it across the windshield, then fold the sun visors down to hold it in place. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Windshield Sunshade.